Serial: DA4 014718

The PC 40-40 is a PC 40 with a 40MB hard disk from factory instead of the 20MB one. The unit came without floppy drives and without PSU, but had an 80287 co-processor installed, an additional RAM card and two i/o cards.
It is probably the only existing machine with its original keys 🙂

• Mainboard: NBI 4200:
  • Processor: 80286
  • Processor Speed: 10MHz
  • Onboard Memory: 1MB [512kB/512kB]
  • BIOS: Award
  • NPU Options: 80287 installed

• WD1003-WA2 Hard Disk/Floppy Controller IO card

• Video Card: ATI EGA Wonder Rev. 1 from 1987
  • Video RAM: 256kB
  • Supports CGA, Hercules mono & EGA graphics modes

• Floppy drives:
  • A: Samsung SFD-321B 3,5″ HD 1,44MB
  • B: Toshiba ND-08DE 5,25″ HD 1,2MB

• HDD: Hitachi DK521-5:
  • Interface: MFM
  • Physical Size: 5.25″ HH
  • Capacity: 40MB
  • Speed: 3,600RPM
  • Type 26: 823/6/17

• RAM expansion: 2MB 16 bit ISA card by unknown manufacturer.
  • DIP settings:
    • 1011111111 = 512kB
    • 1011101111 = 1024kB
    • 1011100111 = 2048kB

• work performed:
  • whole machine completely dismantled and cleaned
  • PSU recapped with Rubycon 105° caps
  • motherboard and all expansion cards recapped, all tantalums replaced with Rubycon 105° aluminum caps
  • small spots on metal cover and chassis repainted
  • internal battery velcro re-attached
  • all metal slot covers restored to former shine and glory
  • missing floppy drives and missing PSI replaced
  • one corner of the front badge re-glued
  • damaged stickers on the back halfway re-attached
  • missing floppy grounding wires replaced
  • HDD backup [Ghost 2]

PC 40 Technical Manual